I am having this exact same issue. I have been looking at these toubleshooting stepos for several month and none of them work!. My PC is perfectly connected to the phone via bluetooth, it streams media from my phone to PC over bluetooth (with sound) I just can not get the audio out from phone calls. I looked at my sound setting and have this issue that I do not think belongs. There are also other Devices in Device manager that need a home too. But the A2DP SNK is what drives the audio out to my PC. The od thing is if I uninstall my realtek drivers, I get the basic Microsoft Default HD Audio device. Once I do that the Device is shown under the Audio section of Bluetooth and Other Devices. It does not change the fact that I do not get audio out from a phone call but it is strange once I install the relatek driver that entry for audio in bluetooth and other devices disappears. I have done multiple factory resets of the PC I have done multiple factory resets of the phone.
Unfortunately I have little faith in Samsungs ability to help me trouble shoot as The Phone support there does not know the difference between hardware and software. and at one point I got chat support for samsung involved, He told me My s20 was not capable. I showed him several youtube videos of this working and he tried it himself over chat, and said huh, I can do that with my phone and I have the same phone and OS you do.
Dear Microsoft I have done a Feedback on this several weeks ago. Please help us!
Thank you.